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%D \module
%D [ file=scrn-pag,
%D version=1998.01.15,
%D title=\CONTEXT\ Screen Macros,
%D subtitle=Pages, % moved code
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
% pagecomments will be done differently
\writestatus{loading}{ConTeXt Screen Macros / Pages}
\registerctxluafile{scrn-pag}{}
\unprotect
\installcorenamespace{interactionscreen}
\installparameterhandler \??interactionscreen {interactionscreen}
\installsetuphandler \??interactionscreen {interactionscreen}
\newdimen\canvaswidth
\newdimen\canvasheight
\newdimen\canvasbackoffset
\newdimen\canvastopoffset
\newdimen\canvasmaxwidth
\newdimen\canvasmaxheight
\newdimen\canvascropoffset
\newdimen\canvastrimoffset
\newdimen\canvasbleedoffset
\newdimen\canvasartoffset
\newconditional\c_scrn_canvas_tight_page
\def\scrn_canvas_calculate
{\begingroup
\edef\currentinteractionscreenwidth {\interactionscreenparameter\c!width }%
\edef\currentinteractionscreenheight{\interactionscreenparameter\c!height}%
\canvasbackoffset\backspace
\canvastopoffset\topspace
\donetrue
\ifx\currentinteractionscreenwidth\v!max
\global\canvaswidth\printpaperwidth
\else\ifx\currentinteractionscreenwidth\v!fit
\donefalse
\global\canvaswidth\dimexpr
\leftcombitotal
+ \makeupwidth
+ \rightcombitotal
+ 2\dimexpr
\interactionscreenparameter\c!backspace
+ \interactionscreenparameter\c!horoffset
\relax
\relax
\else\ifx\currentinteractionscreenwidth\v!tight
\donefalse
\ifdim\backspace>\canvaswidth
\ifdim\backspace>\zeropoint\relax
\global\advance\canvasbackoffset -\canvaswidth
\fi
\fi
\global\advance\canvaswidth\dimexpr
\makeupwidth
+ \rightcombitotal
+ 2\dimexpr
\interactionscreenparameter\c!backspace
+ \interactionscreenparameter\c!horoffset
\relax
\relax
\else
\donefalse
\global\canvaswidth\currentinteractionscreenwidth
\fi\fi\fi
\ifx\currentinteractionscreenheight\v!max
\global\canvasheight\printpaperheight
\else\ifx\currentinteractionscreenheight\v!fit
\donefalse
\global\canvasheight\dimexpr
\topheight
+ \topdistance
+ \makeupheight
+ \bottomdistance
+ \bottomheight
+ 2\dimexpr
\interactionscreenparameter\c!topspace
+ \interactionscreenparameter\c!veroffset
\relax
\relax
\else\ifx\currentinteractionscreenheight\v!tight
\donefalse
\global\canvasheight\dimexpr\topheight+\topdistance\relax
\ifdim\topspace>\canvasheight
\ifdim\topspace>\zeropoint\relax
\global\advance\canvastopoffset -\canvasheight
\fi
\fi
\global\advance\canvasheight\dimexpr
\makeupheight
+ \bottomdistance
+ \bottomheight
+ 2\dimexpr
\interactionscreenparameter\c!topspace
+ \interactionscreenparameter\c!veroffset
\relax
\relax
\else
\donefalse
\global\canvasheight\currentinteractionscreenheight
\fi\fi\fi
\ifconditional\c_page_layouts_location_is_set
\global\setfalse\c_scrn_canvas_tight_page
\fi
\ifconditional\c_scrn_canvas_tight_page
\global\canvasmaxwidth \paperwidth
\global\canvasmaxheight\paperheight
\else
\global\canvasmaxwidth \printpaperwidth
\global\canvasmaxheight\printpaperheight
\fi
% new:
\ifdone
\global\canvascropoffset \layoutcropoffset
\global\canvastrimoffset \layouttrimoffset
\global\canvasbleedoffset\layoutbleedoffset
\global\canvasartoffset \layoutartoffset
\else
\global\canvascropoffset \zeropoint
\global\canvastrimoffset \zeropoint
\global\canvasbleedoffset\zeropoint
\global\canvasartoffset \zeropoint
\fi
\endgroup}
\newdimen\layoutcropoffset
\newdimen\layouttrimoffset
\newdimen\layoutbleedoffset
\newdimen\layoutartoffset
\appendtoks
\edef\p_cropoffset{\layoutparameter\c!cropoffset}%
\ifx\p_cropoffset\v!auto
\ifconditional\c_page_layouts_location_is_middle
\scratchheight\dimexpr(\printpaperheight-\paperheight)/2\relax
\scratchwidth \dimexpr(\printpaperwidth -\paperwidth )/2\relax
\layoutcropoffset\ifdim\scratchheight>\scratchwidth\scratchheight\else\scratchwidth\fi
\layouttrimoffset \layoutparameter\c!trimoffset
\layoutbleedoffset\layoutparameter\c!bleedoffset
\layoutartoffset \layoutparameter\c!artoffset
\else
\writestatus\m!system{auto crop etc only supported when location=middle}%
\layoutcropoffset \zeropoint
\layouttrimoffset \zeropoint
\layoutbleedoffset\zeropoint
\layoutartoffset \zeropoint
\fi
\else
\layoutcropoffset \layoutparameter\c!cropoffset
\layouttrimoffset \layoutparameter\c!trimoffset
\layoutbleedoffset\layoutparameter\c!bleedoffset
\layoutartoffset \layoutparameter\c!artoffset
\fi
\relax
\to \everysetuplayout
\setuplayout
[\c!cropoffset=\zeropoint,
\c!trimoffset=\zeropoint,
\c!bleedoffset=\zeropoint,
\c!artoffset=\zeropoint]
% test the next when something is changed here:
%
% \setuppapersize[A5][A3] \showframe
%
% % \setuplayout[location=middle] \setupinteractionscreen[option=fit]
% % \setuplayout[location=middle] \setupinteractionscreen[option=auto]
% % \setupinteractionscreen[option=fit]
% % \setupinteractionscreen[option=auto]
%
% \starttext \input ward \stoptext
\let\scrn_canvas_synchronize_simple \relax
\let\scrn_canvas_synchronize_complex\relax
\appendtoks
\glet\scrn_canvas_synchronize_simple \scrn_canvas_synchronize_simple_indeed
\glet\scrn_canvas_synchronize_complex\scrn_canvas_synchronize_complex_indeed
\to \everysetuplayout
\appendtoks
\glet\scrn_canvas_synchronize_simple \scrn_canvas_synchronize_simple_indeed
\glet\scrn_canvas_synchronize_complex\scrn_canvas_synchronize_complex_indeed
\to \everysetuplayouttarget
\def\scrn_canvas_synchronize_only
{\clf_setupcanvas
paperwidth \printpaperwidth
paperheight \printpaperheight
\relax}
\def\scrn_canvas_synchronize_set#1#2%
{\clf_setupcanvas
paperwidth \dimexpr#1\relax
paperheight \dimexpr#2\relax
\relax}
\let\scrn_canvas_synchronize_reset\scrn_canvas_synchronize_only
\def\scrn_canvas_synchronize_simple_indeed
{\scrn_canvas_synchronize_only
%\glet\scrn_canvas_synchronize_simple \relax
\glet\scrn_canvas_synchronize_complex\relax}
\def\scrn_canvas_synchronize_complex_indeed
{\scrn_canvas_calculate % otherwise we need to hook it into setuppage etc
\clf_setupcanvas
mode {\interactionscreenparameter\c!option}%
singlesided \ifsinglesided true\else false\fi\space
doublesided \ifdoublesided true\else false\fi\space
leftoffset \canvasbackoffset
topoffset \canvastopoffset
width \canvaswidth
height \canvasheight
paperwidth \canvasmaxwidth
paperheight \canvasmaxheight
cropoffset \canvascropoffset
trimoffset \canvastrimoffset
bleedoffset \canvasbleedoffset
artoffset \canvasartoffset
copies \numexpr\interactionscreenparameter\c!copies\relax
print {\interactionscreenparameter\c!print}%
\relax
%\glet\scrn_canvas_synchronize_simple \relax
\glet\scrn_canvas_synchronize_complex\relax}
\appendtoks
\begingroup
\edef\p_option{\interactionscreenparameter\c!option}%
\ifx\p_option\v!max
\global\settrue \c_scrn_canvas_tight_page
\else\ifx\p_option\v!fit
\global\settrue \c_scrn_canvas_tight_page
\else
\global\setfalse\c_scrn_canvas_tight_page
\fi\fi
\endgroup
\to \everysetupinteractionscreen
\setupinteractionscreen
[\c!width=\printpaperwidth,
\c!height=\printpaperheight,
\c!horoffset=\zeropoint,
\c!veroffset=\zeropoint,
\c!backspace=\backspace,
\c!topspace=\topspace,
\c!copies=\plusone, % not the best place but backend anyway
\c!option=\v!auto]
\appendtoks
\glet\scrn_canvas_synchronize_simple \scrn_canvas_synchronize_simple_indeed
\glet\scrn_canvas_synchronize_complex\scrn_canvas_synchronize_complex_indeed
\to \everysetupinteractionscreen
%D Conditional page breaks:
\unexpanded\def\screen
{\dosingleempty\scrn_screen}
\def\scrn_screen[#list]%
{\iflocation
\page[#list]%
\fi}
%D Page transitions:
\let\scrn_transitions_list\empty
\unexpanded\def\setuppagetransitions
{\dosingleempty\scrn_transitions_setup}
\def\scrn_transitions_setup[#list]%
{\edef\scrn_transitions_list{#list}%
\ifx\scrn_transitions_list\v!reset
\let\scrn_transitions_list\empty
\fi}
\def\scrn_transitions_set
{\iflocation \ifx\scrn_transitions_list\empty \else
\scrn_transitions_set_indeed
\fi \fi}
\def\scrn_transitions_set_indeed
{\begingroup
\edef\currentinteractionscreendelay{\interactionscreenparameter\c!delay}%
\clf_setpagetransition
n {\scrn_transitions_list}%
delay \ifx\currentinteractionscreendelay\v!none \zerocount\else\currentinteractionscreendelay\fi
\relax
\endgroup}
\prependtoks
\scrn_transitions_set
\to \everyshipout
\setupinteractionscreen
[\c!delay=\v!none]
\setuppagetransitions
[\v!reset]
\protect \endinput
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